碳酸氢铵对白茅和藨草吸收重金属的影响

目的]为人工修复重金属污染土壤探索新方法。方法]以分析纯碳酸氢铵为调控剂,以白茅和藨草为试材进行盆栽调控试验并在3个月后测定其重金属含量。结果]3~5 g/L碳酸氢铵显著增加了白茅对Zn的积累（5 809.11 mg/kg）。3 g/L碳酸氢铵显著增加了白茅对Pb的积累（约38.11 mg/kg）。0.5 g/L碳酸氢铵调控下,藨草对土壤中Pb污染的净化率最大（0.01%）。5 g/L碳酸氢铵调控下,白茅对土壤中Cd污染的净化率最大（0.17%）,藨草对土壤中Zn污染的净化率最大（0.4%）,白茅对土壤中Pb污染的净化率最大（0.01%）。3 g/L碳酸氢铵调控下,藨草对土壤中Cd污染的净化率最大（0.1%）,白茅对土壤中Zn污染的净化率最大（0.31%）。结论]碳酸氢铵能提高植物对污染土壤的净化率。

Effects of Ammonia Bicarbonate on the Absorption of Heavy Metals in Imperata cylindrica and Scirpus triqueter

Objective] The purpose was to explore the new method of repairing heavy metal polluted soil by human-induced restoration.Method] With analytically pure ammonia bicarbonate as restraining reagent,Imperata cylindrical and Scrirpus triqueter as tested materials,the regulated pot culture experiment was performed and their contents of heavy metals were determined after 3 months.Result] 3~5 g/L ammonia bicarbonate significantly increased the accumulation of Zn in I.cylindrical and its accumulation amount was 5 809.11 mg/kg.3 g/L ammonia bicarbonate significantly increased the accumulation of Pb in I.cylindrical and its accumulation amount was about 38.11 mg/kg.Under the regulation with 0.5 g/L ammonia bicarbonate,the purifying rate of S.triqueter on Pb in polluted soil was highest,being 0.01%.Under the regulation with 5 g/L ammonia bicarbonate,the purifying rate of I.cylindrical on Cd in polluted soil was highest,being 0.17%;the purifying rate of S.triqueter on Zn in polluted soil was highest,being 0.4%;the purifying rate of I.cylindrical on Pb in polluted soil was highest,being 0.01%.Under the regulation with 3 g/L ammonia bicarbonate,the purifying rate of S.triqueter on Cd in polluted soil was highest,being 0.1%;the purifying rate of I.cylindrical on Zn in polluted soil was highest,being 0.31%.Conclusion] Ammonia bicarbonate could enhance the purifying rate of plants on polluted soil.